If you run a website with multiple admin users, you might find a plugin is installed and you don’t know who installed it.

If you’d like to audit who installs plugins, and other types of admin actions there are several audit plugins to choose from:

5 WordPress activity logs plugins compared
What type of events does it log? Ease of use
(1-5)		 What type of sites should use it? Price
WP Security Audit Log Nearly every type of event 3 Security-conscious websites Free, with premium add-ons
Simple History Almost every event, except core updates and changes to Multisite 5 Websites that only need a basic solution Free
User Activity Log Almost every event, except core updates and changes to Multisite 4 Sites with multiple contributors Free and premium options
Simple Login Log Login attempts and successes 5 Any type of site Free
WP Log Viewer All types of WordPress error messages 2 Websites with frequent troubleshooting needs and staging platforms Free